42745091 has 2 divisors, whose sum is σ = 42745092. Its totient is φ = 42745090.

The previous prime is 42745081. The next prime is 42745093. The reversal of 42745091 is 19054724.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42745091 - 2¹⁰ = 42744067 is a prime.

It is a Sophie Germain prime.

Together with 42745093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42745093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21372545 + 21372546.

It is an arithmetic number, because the mean of its divisors is an integer number (21372546).

Almost surely, 2^42745091 is an apocalyptic number.

42745091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42745091 is an equidigital number, since it uses as much as digits as its factorization.

42745091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 42745091 is about 6537.9730039210. The cubic root of 42745091 is about 349.6461484976.

The spelling of 42745091 in words is "forty-two million, seven hundred forty-five thousand, ninety-one".